FR2614835A1 - INK MECHANISM FOR A PRINTING MACHINE - Google Patents

Abstract

THE INK MECHANISM OF A PRINTING MACHINE IS CONSTITUTED BY A COLOR APPLICATOR DEVICE 7 APPLIED AGAINST A COLOR 6 APPLICATOR CYLINDER EQUIPPED WITH AN ELASTIC SURFACE, THIS DEVICE FORMING A COLOR FILM PREDOSE 8 ON THE COLOR APPLICATOR CYLINDER 6 A METERING TAPE 12 SCRAPS THE FILM OR FILM OF PREDOSE COLOR 8 AND BRINGS IT TO THE QUANTITY NECESSARY FOR ITS TRANSFER ON THE CLICK-HOLDER CYLINDER 4. THE EXCESS AND SCRAPPED COLOR 13 FLOWS FREELY. THE METERING BAND 12 PERFORMED FOR SELF-CLEANING PURPOSES A DIRECT MOVEMENT PREFERABLY IN PERIPHERAL DIRECTION OF THE COLOR APPLICATOR CYLINDER 6, SO THAT THE REGION WHICH IS IN CONTACT WITH THE COLOR APPLICATOR CYLINDER 6 AND FORMING THE INTERSTICE DOSAGE IS CONTINUALLY CHANGED.

Description

The invention relates to an inking mechanism for a machine

  no printing, comprising at least one forme cylinder

  supporting a cliche, a color applicator cylinder

  pleading against the platen cylinder and presenting an over-

  elastic face, a color applicator device which applies color to the color applicator roll and a

  metering device which can be brought into contact with the cylinder

dre color applicator.

  An arrangement of this type is known from DE 32 25 982. According to this arrangement, the color is transferred.

  of a color vessel which is limited, on the one hand, by a

  king of color retention and, secondly, by an element

  on the color applicator roll equipped with a surface

  this elastic. The metering element which is mounted practically

  tangentially against the applicator cylinder forms on this cy-

  lindre applicator a thin film or color film suitable for its transfer on the cylinder-cliche, and therefore retains

  the color in the color tank, except for the quantity

  tite caused in the gap between the metering element and the applicator cylinder. A reserve of color remains

  for a long time in the tank due to the very low

  color which is thus driven.

  A significant hydrodynamic pressure is formed in the color gap due to the surface of application or

  relatively large support of the metering element. To obtain

  to hold a film of constant color and sufficiently thin, it is necessary that the metering element is applied with a high force

  against the elastic surface of the color applicator roll.

  It results from this high application force that a request for

  significant importance is applied to the elements involved in the dosing operation, which

  wear of these elements. But as the demand for

  applied to these elements, it simultaneously results in an exaggerated heating, and in particular also the color. The color heats very strongly precisely at the region of the edge of the metering element because the color reserve is carried very slowly by the interstice

  proportioner. This rise in temperature may have as

  sequence a change in the property of the color that

  immediately exerts its effect on the quality of printing.

  We tried to keep the heating under control at

  yen of large cooling devices

aunts and appropriate.

  Due to the high compression force that is

  In the dosing gap, due to the hydrodynamic pressure of the color and the practically tangential application of the dosing element to the applicator cylinder, there is also the danger that the front edge of the dosing element in the applicator roll due to the elastic nature of the surface of the applicator roll. This can happen especially when there is lack of color, and

  can therefore cause significant damage to the whole of the

printing.

  The turbulence of the color that takes place in the tank

  with color and that one seeks on the one hand to obtain

  keeping the edge of the dosing element free of sound soil particles, furthermore undoubtedly

  , a thin color film that must be applied with a large

  of regularity. However, this turbulence does not safely exclude pollution of the edge of the metering element. The

  particles of dirt that stick to the edge of the

  Metering make the color film form on the cylinder

  applicator of the striations which are transmitted to the cylinder

  plate despite oscillating rollers of the cou-

  theirs, and are thus also visible on the printed copy.

  me. When there are no outside influences, these

  dirt particles remain stuck on the edge of the element

  metering and have a negative influence on the quality of the

  until the dosing element has been cleaned.

  Other tests which were carried out to form a color film on the color applicator roll provided with an elastic surface with the aid of a single metering element which fulfills the conditions necessary for its transfer on the forme cylinder have given nothing, especially because of the pollution problems that appear, which is why none of the solutions proposed to date

could not be successful.

  The object of the present invention is to provide an inking mechanism comprising the smallest possible number of rolls, which transfers the color film formed directly onto a color applicator roll provided with an elastic surface on the plate supported by a cylinder holder,

  whose regularity is ensured during the printing operation.

  without the metering element and the color applicator roll having an elastic surface being subjected to high stresses, thus making it possible to maintain

  a very low level of wear and temperature increase

  re. At the same time, the invention aims that the dosing element

  eliminates disturbing dirt particles on the

metering machine.

  The solution to this problem is obtained by the combination of

its following features:

  the color applicator device produces a film of color

  their predosed on the color applicator cylinder, - the metering device is constituted by at least one strip

  metering machine that scrapes the predosed color film on the cylinder

  color applicator depending on the quantity required.

  In the case of transfer to the forme cylinder, - the excess color which has been scraped off by the dosing belt flows freely, - the dosing band is fixed in such a way that at least a part

  of this metering strip which forms the interstice of dosage

  have adjusted themselves for continuous self-cleaning by

  killing an oscillating movement and preferably in the peripheral direction of the color applicator roll, so

  that a different region of the measuring band is

  the dosing interstice with the cylinder

coloreur.

  Oscillating motion of at least part of the band

  the dosing system effectively prevents to a certain extent

  cumulation and sticking of dirt particles on the edge of the metering strip as the region of the strip

  metering machine that is in contact changes continuously. By the-

  Soiling particles are thus continually removed.

  on the one hand by the excess color which is rejected by the dosing belt and on the other hand by the measured color film itself, which makes it possible to avoid the formation of

  streaks caused by soil particles on the cy-

lindre color applicator.

  Turbulence that would be likely to have a

  disturbing influence on the color film dosed and terminated

  are largely avoided because only a pre-colored color film on the color applicator roll comes into contact with the metering strip and the excess color can flow without obstacles. This excess color is advantageously received

  in a collecting container and sent either to a

  preparation of color where it is again

  sent in the color applicator device, either sent directly to the color applicator device. Thanks to an appropriate dosage of the amount of color predisposed by the

  color applicator device and with the short duration of

  day of the color in the color applicator device, it is avoided that the color and the elements which take part in the formation and the determination of the final color film do not

  are exaggerated, so that one can

  to avoid additional cooling.

  We also avoid with this inking mechanism what we

  calls "ghost-images" on the printed product. The disc

  positive color applicator shape continuously on the color applicator cylinder a new color film and

  which is reduced to the value determined by the band

  which is transmitted on the form of printing. The cylinder

  The color applicator may therefore have a different diameter.

  and preferably smaller than the platen roller.

  According to an advantageous improvement of the measures

  above, one can obtain the oscillating motion of the

  metering strip in the peripheral direction of the cylinder

  color meter by providing the metering strip with a cylindrical measuring edge and rotating the strip

2614 5S

  metering device about the axis of the cylinder which is defined by the rounded ridge of cylindrical shape. Advantageously, the assembly

  the measuring belt is made by means of

  which are provided on the front sides of the dosing belt and whose axis of rotation coincides with the axis of the defined cylinder.

  nor by the rounded ridge of cylindrical form. We are thus

  sure that the thickness and shape of the dosing interstice

  exactly the same during the pivoting of the band

  Seuse. According to another advantageous improvement of the measures indicated above, the metering strip can be applied on a

  support beam with support elements. Thanks to this agency

  The result is that the dosing belt is massively supported

  over the entire width of the roll applicator roll

  their. It is also possible to adjust in a very simple way

  this dosing between the color applicator cylinder and the

  metering strip by means of adjusting elements provided on the

support.

  Another advantageous feature can also be obtained.

  tagger of the measures indicated above by articulately connecting the metering strip with two parallel oscillating arms

  between them. These two oscillating arms are articulated to two

  swivel heads that are parallel to the dosing belt. The pivoting levers are held at one of their ends on a fixed support, the center of rotation of the fixed bearings and the center of rotation of the axis of rotation of the metering strip being located on a straight line. This makes it possible to obtain that no support needs to be provided in the immediate vicinity of the

  surface of the color applicator cylinder. This also allows

  There are several measuring belts on the width of the color applicator roll. The gap setting of

  dosing between the color applicator roll and the tape -

  metering process is easy because one of the

  of a pivoting lever can be moved in a known manner

  relative to the other fixed bearing, by known means.

  To protect the edge of the measuring belt which is

  born in a very precise way, this edge can be advantageous-

261 48]

  covered with a flexible sheet-shaped plate which is fixed so that it can be replaced easily and simply. The movement of the area of the dosing band that forms the dosing gap can also be achieved by making

  oscillate the sheet that is tight on the metering strip

  and forth and in the peripheral direction of the color applicator roll. The advantage in this case is that the dosing belt

can be fixed mounted.

  In all these described embodiments, it is furthermore possible to arrange in known manner against each other, for printing machines with several widths of sides, several metering strips and several wide-sided color applicator devices. Thanks to this arrangement against each other, one can obtain without problems a

  color separation over the width of the sides.

  The invention will now be described in the following with reference to the embodiments shown in the drawings. In the drawings: Fig. 1 represents an inking mechanism of a machine

  rotary offset printing machine with inking mechanism and

  anchor, shown schematically, FIG. 2 is a schematic representation of the pivoting metering strip, FIG. 3 is a schematic representation of an assembly of the dosing belt, FIG. 4 is a sectional view of a support of the metering strip on a support beam,

  Fig. 5 represents the mounting of the metering strip at

  yen of pivoting levers and oscillating arms, Fig. 6 is a sectional view of a metering strip provided with a protective coating, FIG. 7 is a sectional view of a metering strip equipped

  a flexible plate in the shape of a sheet, oscillating in va-and-

  comes, Fig. 8 is a sectional view of a pivot support member

26148 =

  both around the axis of the color applicator roll, with a flexible sheet-shaped plate, and

  Fig. 9 is a sectional view of a metering strip constituting

  killed by a support beam and a rotating bar.

  The inking mechanism, schematically represented at. Fig. 1, an offset rotary machine is constituted by a rubberized fabric cylinder 1 against which is applied a

  pressure cylinder 2, which can also be

  killed in the form of another cylinder with rubberized fabric. The paper strip 3 to be printed is passed and compressed between

  rubberized fabric cylinder 1 and the counter-pressure cylinder

  2. On the rubberized fabric cylinder 1 is applied

  a forme cylinder 4 supporting print forms

  series. This plate cylinder 4 is associated with a device

  mooring 5, known and shown schematically, which trans-

  place the anchoring agent on the plates. In contact with the

  plate cylinder 4 is also provided with a cylinder

  color indicator 6 which has an elastic surface. Thanks to a color applicator device 7, a film or film

  of pre-dosed color and having a constant mass is

  the entire width of the color applicator roll 6 by means of the color applicator device 7, the thickness of the film being several times greater than

  that of the color film 9 to be transferred to the

  The color applicator device 7 is constituted, in the present embodiment, by a

  color vessel 10 which is provided in a known manner with a colorimeter

  be adjustable 11 determining the dosage. We can also imagine

  giner other color applicator devices that are known and that can produce the pre-colored color film 8 on a color applicator roll 6. The pre-colored color film 8 that is taken from the color applicator roll

  6 is scraped by a metering strip 12 mounted as a result of

  positive color applicator 7. This results in the film's

  color 9 which is transferred to the forme cylinder 4.

  The excess color 13 which is scraped by the metering strip 12 flows freely into a collection container 14 where the collected color is directed directly to the device

  color applicator 7 or to a preparation plant

  color not shown, to be repumped

  from there to the color applicator device 7.

  The color film 9 which is transferred to the cylinder

  plate holder 4 has a constant thickness on the totality

  This thickness can be adjusted by a more or less strong application of the metering strip 12 against the color applicator roll 6, which can be achieved by means of mechanical mechanisms.

  known and not shown.

  The color applicator device 7 constitutes on the color applicator roll 6 a pre-colored film 8 which is completely new, so that the color applicator roll 6 which rotates at the same speed as the forme cylinder 4 may have a diameter different from that of the forme cylinder 4, and preferably smaller, without

  danger of forming so-called "images-

ghosts ".

  Fig. 2 shows a partial view of the cylinder

  color printer 6 which is in contact with the dosing belt

  12a. The color applicator roll 6 is provided with a cover

  elastically 15 and rotates in the direction of the arrow 16.

  The metering strip 12a has on its edge 17 which is turned towards the color applicator roll 6 a cylindrical surface. The axis 18 of this cylindrically shaped surface also constitutes the axis of rotation 19 around which the

  metering strip 12a can pivot on an angle o <, which can vary

from 5 to 30

  Fig. 3 shows how a metering element 12a

  can be mounted in a printing machine. The cylinder

  color plier 6 is mounted between two side walls

  and 21 of the printing machine. The axis 22 of the cylinder

  color plater is rotatably mounted in two

  bearings 23 and 24 which are attached to the side walls 20 and 21.

  The metering strip 12a comprises on each of its front lateral ends a tab 25,26 in which is fixed a -1a9,1 anb jaTA9 ilnod -O0 uoT1e; ap ap axis, 1 lsa uoile8oi ap uu; uaz aT luop '6u anbrapuTîX3 amWoj in a snos, anlTlsuoa 9ga al ins quawaloAtd ap luawaAnow an al [nsa, ua ii 'qluaspidai or uaiow a lee l9 Tndde, p luawgal, lmns luaiA-la-eAaa ago -eldap wing lnad qZL asnasop apueq el -uawassTu e atiled an alduaxa of the elder; Inad L7 Tnddep luawl [, 1 'Z7 Tndde, p ail -nod aun qxTj Isa Tnb aluepuodsaao 3 awIoj ap L7 Tndde, p quawgli an insbbbtipuriîa awioj ap 6u, ao uos 1ed asodai Oç qzL asnasop apueq the aquelsuoa Isa b7 uole; ap apael ap aiedgs ai Tnb 8 aouelsTp el quop the '9 inatnoa ap naleoaTldde aipurTXO np qsoddo, lq Isa inb 6 9qgao uos ins anbripurlxa aw -ioj au nosoos agwiojuoa quawale6p Isa' anbrIseL, 3 aoejins aun, p 9dTnbg 9 gnaînoa ap inaeandTdde aipuiAoa al sîa ^ apuino3 8ú SZ algie uos: ns anbTapuTIAa awioj ap aaejlns aun; uawale6 seo aa suep puaidmod Tnb 'qzL asnasop apueq el' ZL asnasop apueq el ap a6eluow ap 91TITqTssod am in ne aiquow b '-Tj el aaeldgp as eZL asnasop apueq el allanbel ç aouanbgj and auTwiaq9p Lú inalow np uoTmeqoî ap assaITA el Oz - alo ^ Ard qnad eZL asnasop apueq el janbal ins "al ue, [iaxTj ap lawaad inb aa '9u anbsTp np uo; oi apaiquaa ne lioddei Ied aisToqa Inad uo, the anb aauelsTp aun ajuasaid çç a Tl el L-ú inalow a îed uoTileoi ua auTequa 9ú anb sTp an apxTJ Isa Tnb çç afTI to the ins gITwgi; xa azine uos ea ^ ie; oi uoSej ap pquow Isa bú queTTaso seiq ali udcpdddpdnotlnnnrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr A number of people have been identified as having a high level of literacy and a high level of literacy. They have also been able to work with them in the field of education, education and the arts, as well as in the field of foreign affairs. aipurTIa al ail -ua anITIsuoo qsa Tnb Lú aesop ap aaT-sîaquTm, laaBay issuing 3uop) nad uo uoTristods alla ^nal inal ss sxjuep sXJuep sXTj la 'saluas -aJdaI uou suaXow sap.ed' uoTme; oi aa spauleiua ai,, ImoAnod ç q seqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq axTj 8Z'LZ Tnddep uoITinoa

261,483:

  41, the dosing belt 12b 'is provided with a protective plate 43 which deflects the scraped color by the dosing belt 12b around the support element 41. In FIG. 4 are shown the two end positions of the pivoting metering strip 12b (on the left in continuous lines and on the right in phantom). To be able to modify in this case the dosing gap, the support beam 42 is provided with

  means not shown to raise and lower

  this support beam 42, as shown by the arrow

101.

  Another possibility of mounting the metering strip 12 is shown in FIG. 5. On the dosing belt 12c, which extends

  on at least a portion along the envelope line of the cy-

  lindre color applicator 6, are articulated on its two front sides two respective oscillating arms 44 and 45 by means of pivot pins 46 and 47. The oscillating arm 44 and the oscillating arm 45 are hingedly connected by

  two pivoting levers 48 and 49, so that the oscillating arm

  lant 44 forms with the pivoting lever 48 the hinge 50 and

  with the pivoting lever 49 the hinge 51, the oscillating arm

  lant 45 forming with the pivoting lever 48 the articulation 52

  and with the pivoting lever 49 the hinge 53. The hinge arm

  34 is parallel to the oscillating arm 45. The pivoting lever

  both 48 and the pivoting lever 49 are parallel to the strip

  dosing device 12c. In this case, the dosing belt 12c also

  edge 54 facing towards the applicator cylinder

  their 6, comprising a cylindrical surface and a fixed cylinder axis 55 which passes through it. The cylinder axis 55 is

  located at a distance "a" from the hinge 46. The pivot lever

  both 48 and the pivoting lever 49 are extended upwards in FIG. 5. On these extensions are mounted bearings which are driven rotatably on fixed axes 56 and 57. The axis 56 is also at the distance "a" of the joint, as well as the axis 57 relative to at the articulation 51. At the articulation 53 is fixed a pneumatic cylinder for performing an oscillating movement to the pivoting lever 49

  around axis 57, as shown by the arrow 59. This movement

  1 1 ment. is transmitted via the oscillating arms 44 and 45 to the pivoting lever 48 and the metering strip 12c. The metering strip thus rotates about the axis of rotation 60 which coincides with the cylinder axis 55. The fixing of the shaft 57 can be carried out so that its position with respect to the axis 56 can be modified, as indicated by the arrow

  61, and that it may be fixed in its new position.

  With this displacement of the axis 57 relative to the axis 56, it is possible to adjust the width of the dosing gap 62

  between the metering strip 12c and the applicator cylinder of

their 6.

  To avoid that the edge 63 of the metering strip 12d, which is turned towards the color applicator roll 6 and which

  is machined very thinly or destroyed by wear, this

  The dosing belt 12d may be provided with a protective coating.

  64, as shown in FIG. 6. The protective coating

  64 which is constituted by a flexible sheet-shaped plate

  is suspended on one side of the metering strip 12d on a number of stops 65 distributed over the width of the strip

  metering device 12d, on which is stretched the ridge 63 forming the

  metering tandice 66, and clamped on the other side of the metering strip 12d by a wand 67 by means of screws 68 which are also arranged over the entire width of the metering strip 12d. When the wear is too pronounced, it is sufficient to replace the protective coating 64 and the metering strip 12d can be used again. We can thus avoid

spending.

  Another possibility of moving the region of the metering strip 12e forming the dosing gap is shown in FIG. 7. The dosing belt 12 is constituted by an element

  carrier 70 fixed to a stable base 71 and a flexible plate

  Leaf-shaped bead 72 stretched over the carrier member 70.

  The edge 73 of the carrier member 70 which faces the color applicator roll 6 has a rounded shape. of the

  grooves 74 are constituted over the width of the element

  70. On a through shaft 75, mounted in the wings that remain between the grooves 74, are mounted rocker elements 76 which are fixed in rotation. The flexible sheet-shaped plate 72 is provided on each side with lugs 77 fixed to the flip-flop elements 76 by screws 78. A lever

  79 is also rotatably connected to the shaft 75.

  On its side 80 which is opposite to the shaft 75, the latter

  is articulated to a pneumatic cylinder 81 which transmits a movement

  oscillating element to the flip-flop elements 76 via

  lever 79, this movement being represented by the arrow 82.

  As a result, the flexible sheet-shaped plate oscillates

  the back and forth on the edge 73 which is turned towards the

lindre color applicator 6.

  Unlike the embodiment shown in FIG. 7, FIG. 8 shows a metering strip 12f which comprises a sheet-shaped flexible plate 83 fixedly mounted at one of its ends 84, while the other end

  is maintained by elastic tensioning means 86.

Bearing member 87, on the edge 88 of which, which is turned towards the color applicator roll 6, is stretched the sheet-shaped flexible plate 83, is fixed on each side

  front of the color applicator cylinder 6 with a pivoting lever

  89, these levers being mounted on their side

  abutment on the axis of rotation 90 of the color applicator roll 6. The stirrup formed by the pivoting levers 89 and the carrier member 87 is pivoted oscillatingly by a

  means not shown at an angle P about the rotational axis

  In this case also, the region of the flexible plate is obtained.

  sheet-like form of the dosing interstice is

  continuously modified. In FIG. 8 are represented the two extreme positions of the oscillating movement: the left position is shown in phantom and the right position

dashed.

  In FIG. 9, the dosing belt 12g is constituted by a support beam 91 provided with a recess 92 forming a

  support shell and provided on the edge 93 facing the cy-

  In this recess 92 is rotatably mounted a cylindrically shaped bar 94. The cylindrical shaped bar 94 may be rotated or oscillated by means not shown as indicated by the arrow 95 In this case also, it is obtained that it is always a different region of the cylindrical bar 94 which forms the dosing interstice 96 with the cy-

lindre color applicator 6.

  As research has shown, good printing results are obtained when the surface of the metering strip 12 of cylindrical shape, which forms the dosing gap, has a radius which is of the order of 0.3 to 1. , 5 mm. It has also been established that when the compression force of the metering strip 12 is changed against the color applicator roll 6, the thickness of the color film is only slowly changed, so that by changing the compression force , we can obtain a very fine staggering of the thickness of the film of

  color. The modification of the radius of the cytoplasmic surface

  lindrique of the metering strip 12 which forms the gap of

  assay has a particularly important influence on

  the color film for the same compressive force of the metering strip 12 against the color applicator roll 6. Thus, the optimum radius can be used according to the

  surface hardness of the elastic coating of the cylinder

  color 6 and the viscosity of the color. The movement

  of the dosing strip 12 according to the described forms has no influence on the color film constituted by the fact that the geometric conditions of the dosing interstice remain

always the same.

  In addition, research has shown that

  12 is preferably arranged in an approximate direction

  radial with respect to the color applicator roll 6.

  In addition to the embodiment described for

  offset printing machines, other printing machines, which use another printing technique, and in particular

  printing techniques that work with a cliché of im-

  pressure, can be equipped with mechanisms

such men.

  Of course, the invention is not limited to the embodiments that have been described; on the contrary, we could design various variants without departing from its scope.

Claims (17)

  1. Inking mechanism for a printing machine,   taking at least one forme cylinder supporting a cli   a color applicator roll applied against the forme cylinder and having an elastic surface, a color applicator device which applies color to the color applicator roll and a metering device which can be brought into contact with the applicator roll. of color, characterized in that: - the color applicator device (7) produces a film or   color film (8) pre-coated on the cylinder   color feeder (6), - the metering device is constituted by at least one metering strip (12) which scrapes the color film (8) pre-coated on the color applicator roll according to the quantity required for transfer onto the door cylinder -cliched (4),   the excess color (13) which has been scraped off by the dosing band   (12) flows freely, - the dosing belt (12) is fixed in such a way that at least a portion of this metering strip (12) which forms the dosing gap can be adjusted for continuous cleaning   by oscillating, and preferably   peripheral recess of the color applicator cylinder (6), so that a different region of the metering strip (12) continuously forms the metering gap with the cylinder color applicator (6).   2. Inking mechanism according to claim 1, characterized   in that the edge of the dosing belt (12) which is rotated   to the color applicator roll (6) and which forms the   dosing terstice has a convex shape.   3. Inking mechanism according to claim 1 or 2, characterized   characterized in that the metering strip (12) is in a substantially radial position with respect to the applicator roll of color (6).   4. ink mechanism according to one of claims 1 to   3, characterized in that adjustment means are provided for adjusting the width of the gap between the dosing belt   (12) and the color applicator roll (6).   5. Inking mechanism according to one of claims 1 to   4, characterized in that the dosing belt (12a) can be pivoted   oscillating on an angle (c <) about an axis of rotation which is parallel to the axis of the applicator cylinder of color (6).   6. Inking mechanism according to claim 5, characterized   rised in that the angle (o <) on which the   metering strip (12a) is preferably located in the range taken between 5 and 30.   7. Inking mechanism according to one of claims 5 and   6, characterized in that the edge (17) of the metering strip (12a is rounded in a cylindrical shape, and in that the axis of rotation (19) of the metering strip (12a) coincides with the axis   (18) of the cylinder defined by the rounded ridge of cylindrical form drique (17).   Inking mechanism according to one of claims 5 to   7, characterized in that support journals (27, 28) are mounted on the front sides of the dosing belt (12a), whose central axes coincide with the axis of rotation (19) of the dosing belt (12a). ) and which are mounted in bearings   (29,30) fixed to the frame (20,21) of the machine.   9. Inking mechanism according to one of claims 1 to   7, characterized in that the metering strip (12b) has a cylindrical surface on the side (39) which is at the oppo   of the color applicator roll (6), which is at a dis-   constant speed (R) of the axis of rotation (40) of the band   sse (12b), and which is pivotally mounted about the axis of rotation (40) of the metering strip (12b) on a corresponding surface of a support beam (42), with interposition   an appropriate support element (41).   An ink mechanism according to one of claims 1   7, characterized in that the dosing belt (12c) is connected   articulated to at least two mutually oscillating arms   parallel (44,45), which are articulated on their side to at least two pivoting levers (48,49) parallel to the band   metering device (12c) and which are held at one of their ends   in fixed bearings (56,57), the center of rotation of the fixed bearings (56,57) of the pivoting levers (48,49) and the center of the axis of rotation (60) of the metering strip (12c) being located on the same line.   11. Inking mechanism according to claim 10, characterized   in that one of the fixed bearings (56, 57) of the pivoting levers (48, 49) is adjustably mounted with respect to the other fixed bearing (57 or 56).   12. ink mechanism according to one of claims 5   11, characterized in that the pivoting movement is realized by a mechanism (58).   13. Inking mechanism according to any one of the   1 to 12, characterized in that the dosing belt (12) is provided, in particular in the region forming the dosing gap (66), with a protective coating (64) which can be easily replaced.   14. Inking mechanism according to claim 13, characterized   characterized in that the protective coating (64) is constituted by a flexible sheet-shaped plate held by fixing and clamping means (65, 67, 68) mounted on the strip dosing device (12d).   15. Inking mechanism according to one of claims 1   4, characterized in that the dosing belt (12e) is constituted   by a fixed carrier member (70) on whose edge (73) facing the color applicator roll (6) is tensioned a flexible sheet-like plate (72) which   can be driven back and forth and oscillating   periphery of the color applicator roll (6) by a mechanism.   16. ink mechanism according to one of claims 1   4, characterized in that the dosing belt (12f) is constituted   killed by a carrier member (87) which is pivotable about the axis of rotation (90) of the color applicator roll (6) at an angle (p), and at the edge (88) of which, which is turned towards the color applicator roll (6) is tensioned a flexible sheet-shaped plate (83) which is held ú6148 5   fixedly at one end (84) and by tensioning means   resilient (86) at its other end (85).   17. Inking mechanism according to one of claims 1   to 4, characterized in that the dosing belt (12g) is   by a carrier beam (91) on the edge (93) of which, which faces the color applicator roll (6), is supported and rotatably mounted a cylindrical bar (94) which can be driven in rotation or way to swing.